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*DECK SNSBFP
SUBROUTINE SNSBFP(IG,IPTRK,KPMACR,KPSYS,NANIS,NLF,NREG,NMAT,
1 NUNKNO,NGRP,MATCOD,FLUX,QEXT)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Compute the QEXT for the solution of SN equations with a Boltzmann-
* Fokker-Planck discretization.
*
*Copyright:
* Copyright (C) 2020 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* IG secondary group.
* IPTRK pointer to the tracking LCM object.
* KPMACR pointer to the secondary-group related macrolib information.
* KPSYS pointer to the system matrix information.
* NANIS maximum cross section Legendre order.
* NLF number of Legendre components in the flux.
* NREG number of regions.
* NMAT number of mixtures.
* NUNKNO number of unknowns per energy group including spherical
* harmonic terms, interface currents, fundamental currents
* and slowing-down angular fluxes at group boundary.
* NGRP number of energy groups.
* MATCOD mixture indices.
* FLUX fluxes and slowing-down angular fluxes at group boundary.
*
*Parameters: output
* QEXT sources and slowing-down angular fluxes at group boundary.
*
*-----------------------------------------------------------------------
*
USE GANLIB
*----
* SUBROUTINE ARGUMENTS
*----
TYPE(C_PTR) IPTRK,KPMACR,KPSYS
INTEGER IG,NANIS,NLF,NREG,NMAT,NUNKNO,NGRP,MATCOD(NREG)
REAL FLUX(NUNKNO,NGRP),QEXT(NUNKNO,NGRP)
*----
* LOCAL VARIABLES
*----
PARAMETER(NSTATE=40,PI4=12.5663706144)
INTEGER JPAR(NSTATE),EELEM,P
CHARACTER CAN(0:19)*2
*----
* ALLOCATABLE ARRAYS
*----
INTEGER, ALLOCATABLE, DIMENSION(:) :: IJJ,NJJ,IPOS
REAL, ALLOCATABLE, DIMENSION(:) :: XSCAT
TYPE(C_PTR) IL_PTR,IM_PTR
INTEGER, POINTER, DIMENSION(:) :: IL,IM
*----
* DATA STATEMENTS
*----
DATA CAN /'00','01','02','03','04','05','06','07','08','09',
> '10','11','12','13','14','15','16','17','18','19'/
*----
* SCRATCH STORAGE ALLOCATION
*----
ALLOCATE(IJJ(0:NMAT),NJJ(0:NMAT),IPOS(0:NMAT))
ALLOCATE(XSCAT(0:NMAT*NGRP))
*----
* RECOVER SNT SPECIFIC PARAMETERS
*----
LFEP=0
CALL LCMGET(IPTRK,'STATE-VECTOR',JPAR)
IF(JPAR(1).NE.NREG) CALL XABORT('SNSBFP: INCONSISTENT NREG.')
IF(JPAR(2).NE.NUNKNO) CALL XABORT('SNSBFP: INCONSISTENT NUNKNO.')
IF(JPAR(15).NE.NLF) CALL XABORT('SNSBFP: INCONSISTENT NLF.')
ITYPE=JPAR(6)
NSCT=JPAR(7)
IELEM=JPAR(8)
ISCAT=JPAR(16)
EELEM=JPAR(35)
CALL LCMGPD(IPTRK,'IL',IL_PTR)
CALL LCMGPD(IPTRK,'IM',IM_PTR)
CALL C_F_POINTER(IL_PTR,IL,(/ NSCT /))
CALL C_F_POINTER(IM_PTR,IM,(/ NSCT /))
*----
* CONSTRUCT THE QEXT.
*----
IJJ(0)=0
NJJ(0)=0
IPOS(0)=0
XSCAT(0)=0.0
IOF0=0
DO 130 P=1,NSCT
ILP=IL(P)
IF(ILP.GT.MIN(ISCAT-1,NANIS)) GO TO 130
CALL LCMGET(KPMACR,'NJJS'//CAN(ILP),NJJ(1))
CALL LCMGET(KPMACR,'IJJS'//CAN(ILP),IJJ(1))
CALL LCMGET(KPMACR,'IPOS'//CAN(ILP),IPOS(1))
CALL LCMGET(KPMACR,'SCAT'//CAN(ILP),XSCAT(1))
IF((ITYPE.EQ.2).OR.(ITYPE.EQ.4)) THEN
*----
* SLAB OR SPHERICAL 1D CASE.
*----
NM=IELEM*EELEM
LFEP=IELEM*NLF*NREG
DO 20 IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) GO TO 20
DO 15 IEL=1,NM
IND=(IR-1)*NSCT*NM+(P-1)*NM+IEL
JG=IJJ(IBM)
DO 10 JND=1,NJJ(IBM)
IF(JG.NE.IG) THEN
QEXT(IND,IG)=QEXT(IND,IG)+FLUX(IND,JG)*
1 XSCAT(IPOS(IBM)+JND-1)
ENDIF
JG=JG-1
10 CONTINUE
15 CONTINUE
20 CONTINUE
ELSE IF((ITYPE.EQ.5).OR.(ITYPE.EQ.6).OR.(ITYPE.EQ.8)) THEN
*----
* 2D CASES (CARTESIAN OR R-Z).
*----
NME=IELEM*IELEM
NM=NME*EELEM
CALL LCMLEN(IPTRK,'DU',NPQ,ITYLCM)
LFEP=NME*NPQ*NREG
DO 70 IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) GO TO 70
DO 65 IEL=1,NM
IND=(IR-1)*NSCT*NM+(P-1)*NM+IEL
JG=IJJ(IBM)
DO 60 JND=1,NJJ(IBM)
IF(JG.NE.IG) THEN
QEXT(IND,IG)=QEXT(IND,IG)+FLUX(IND,JG)*
1 XSCAT(IPOS(IBM)+JND-1)
ENDIF
JG=JG-1
60 CONTINUE
65 CONTINUE
70 CONTINUE
ELSE IF(ITYPE.EQ.7) THEN
*----
* 3D CASES (CARTESIAN)
*----
NME=IELEM*IELEM*IELEM
NM=NME*EELEM
CALL LCMLEN(IPTRK,'DU',NPQ,ITYLCM)
LFEP=NME*NPQ*NREG
DO 110 IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) GO TO 110
DO 100 IEL=1,NM
IND=(IR-1)*NSCT*NM+(P-1)*NM+IEL
JG=IJJ(IBM)
DO 90 JND=1,NJJ(IBM)
IF(JG.NE.IG) THEN
QEXT(IND,IG)=QEXT(IND,IG)+FLUX(IND,JG)*
1 XSCAT(IPOS(IBM)+JND-1)
ENDIF
JG=JG-1
90 CONTINUE
100 CONTINUE
110 CONTINUE
ELSE
CALL XABORT('SNSBFP: TYPE OF DISCRETIZATION NOT IMPLEMENTED.')
ENDIF
130 CONTINUE
*----
* SCRATCH STORAGE DEALLOCATION
*----
DEALLOCATE(XSCAT)
DEALLOCATE(IPOS,NJJ,IJJ)
*----
* RECOVER SLOWING-DOWN ANGULAR FLUXES
*----
CALL LCMGET(KPSYS,'DRAGON-DELTE',DELTAE)
IF(IG.EQ.1) THEN
QEXT(NUNKNO-LFEP+1:NUNKNO,1)=0.0
ELSE
QEXT(NUNKNO-LFEP+1:NUNKNO,IG)=FLUX(NUNKNO-LFEP+1:NUNKNO,IG-1)
1 *DELTAE
ENDIF
RETURN
END
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